ARM: imx: add an exclusive gate clock type

There are a couple of gate clocks are mutually exclusive on i.MX6, i.e.
LVDSCLK1_IBEN and LVDSCLK1_OBEN.  They cannot be enabled simultaneously.
This patches adds an exclusive gate clock type specifically for such
case.  The clock driver will need to call imx_clk_gate_exclusive() to
register a gate clock with parameter exclusive_mask indicating the mask
of gate bits which are mutually exclusive to this gate clock.

Right now, it only handles the exclusive gate clocks which are defined
in a single hardware register, which is the case we're running into
today.  But it can be extended to handle exclusive gate clocks defined
in different registers later if needed.

Signed-off-by: Shawn Guo <shawn.guo@freescale.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/arch/arm/mach-imx/clk.h b/arch/arm/mach-imx/clk.h
index d5ba76f..4cdf8b6 100644
--- a/arch/arm/mach-imx/clk.h
+++ b/arch/arm/mach-imx/clk.h
@@ -36,6 +36,9 @@ struct clk *clk_register_gate2(struct device *dev, const char *name,
 struct clk * imx_obtain_fixed_clock(
 			const char *name, unsigned long rate);
 
+struct clk *imx_clk_gate_exclusive(const char *name, const char *parent,
+	 void __iomem *reg, u8 shift, u32 exclusive_mask);
+
 static inline struct clk *imx_clk_gate2(const char *name, const char *parent,
 		void __iomem *reg, u8 shift)
 {